Hello, There are many issues after I made an upgrade to my macbook pro from the version 10.6.3 to 10.6.4. The main problem is, the os hangs while booting process for more than 5 minutes, and also there were many unnatural restarts after this upgradation. I could not figure out the problem behind this, and also no related info found on google when tried for a fix. Hopefully you will help me in this, thank you.